Muscle damage induced by neuromuscular electrical stimulation (NMES) with frequencies of 30 Hz and 100 Hz

Abstract

See, stats, and : https : / / www . researchgate . net / publication / 280386561 Muscle electrical (NMES) with of Article DOI : 10 . 5935 / 0104 - 7795 . 20150005 CITATIONS 0 READS 58 2 , including : Some : Avaliation Wladimir Universidade 36 SEE All . The . ABSTRACT Neuromuscular electrical stimulation (NMES) is the action of therapeutic electrical stimulation on muscle tissue in order to contract the muscle and consequently improve the muscle status . Objective : To evaluate the muscle damage stemming from isometric muscle contraction induced by NMES of low frequency (30 Hz) and high frequency (100 Hz) . Methods : Experimental crossover study , randomized , unblinded . The study included 10 male college students , age 24 . 4 ± 6 . 0 years , weight 77 . 1 ± 11 . 8 kg , height 176 . 1 ± 5 . 6 cm , and BMI of 24 . 8 ± 3 4 kg / m 2 . Two protocols (A) and (B) with an interval of 7 days between them . (A) - 20 minutes of NMES in the quadriceps at a frequency of 30 Hz (B) - 20 minutes of NMES at a frequency of 100 Hz . Measured lactate , creatine phosphokinase and lactate dehydrogenase before , immediately after , and 6 and 48 hours after the protocols . Results : Comparing 30 Hz vs . 100 Hz the following were observed : lactate (23 . 7 ± 6 . 7 vs . 13 . 4 ± 3 . 0 mg / dl , p = 0 . 001) ; CPK (195 . 4 ± 116 . 1 vs . 262 . 9 ± 153 . 6 IU , p = 0 . 022) ; LDH (374 . 3 ± 64 vs . 366 . 6 ± 84 . 1 IU , ns) . The perception of contractile efficiency decreased significantly (p = 0 . 016) in the 100 Hz Protocol . Conclusion : Both the low - frequency NMES (30 Hz) and the high - frequency (100 Hz) elevate blood markers of muscle damage , most strikingly at the higher frequency . However , the achieved values reflect a normal response to a moderate - intensity exercise .